diff options
| author | Ricardo Ribalda <ribalda@chromium.org> | 2022-11-24 13:39:07 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 14:56:44 +0100 |
| commit | 374b30f27f1ae5a88c7f2868ec4abff9fc14d679 (patch) | |
| tree | ada81763881ebad7febad1a210a9d9eab569c6d6 /drivers/tty/serial/earlycon.c | |
| parent | Linux 6.2-rc4 (diff) | |
| download | linux-374b30f27f1ae5a88c7f2868ec4abff9fc14d679.tar.xz linux-374b30f27f1ae5a88c7f2868ec4abff9fc14d679.zip | |
earlycon: Let users set the clock frequency
Some platforms, namely AMD Picasso, use non standard uart clocks (48M),
witch makes it impossible to use with earlycon.
Let the user select its own frequency.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20221123-serial-clk-v3-1-49c516980ae0@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/earlycon.c')
| -rw-r--r-- | drivers/tty/serial/earlycon.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 4f6e9bf57169..a5fbb6ed38ae 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -120,7 +120,13 @@ static int __init parse_options(struct earlycon_device *device, char *options) } if (options) { + char *uartclk; + device->baud = simple_strtoul(options, NULL, 0); + uartclk = strchr(options, ','); + if (uartclk && kstrtouint(uartclk + 1, 0, &port->uartclk) < 0) + pr_warn("[%s] unsupported earlycon uart clkrate option\n", + options); length = min(strcspn(options, " ") + 1, (size_t)(sizeof(device->options))); strscpy(device->options, options, length); @@ -139,7 +145,8 @@ static int __init register_earlycon(char *buf, const struct earlycon_id *match) buf = NULL; spin_lock_init(&port->lock); - port->uartclk = BASE_BAUD * 16; + if (!port->uartclk) + port->uartclk = BASE_BAUD * 16; if (port->mapbase) port->membase = earlycon_map(port->mapbase, 64); |